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. 2016 Aug 16;16:225. doi: 10.1186/s12884-016-1009-6

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Random-effetcs meta-analysis comparing gestational age at labour between control groups and L-aginine groups. The test for heterogeneity was not significant (P = 0.19),the standardized mean difference significantly favors controls (0.30, 95 % CI [0.07,0.54], P = 0.012)